Braking system



Feb. ZG, 1923.y

C. G. PULLIN BRAKING SYSTEM Filed July 20, 1920 2 sheets-sheet l C. G.@WMM In ven r'.

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Peb. 20, 1923.

C. G. PULLIN BRAKING SYSTEM Filed vJuly 20, 1920 2 sheets-sheet 2section.

Patented Feb. 2li, i923.

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lfzairenr CYRIL' GEORGE Bottin, or ESLEWORTH, ENGLAND.

marraine sYsTEM.

Application filed july 20,

[o all wlw/)rt fait, may concern." 1 1 Be it lrnoivn that CYRILGuionesiU'LLrN,` a subject of the Kingv of Great Britain, re siding atlsleivorth, i lliddlesex, England, have invented certain new landuseful' lm-` provements in or Relating to` Braking Sys-` tems, ol? whichthe tollowingis a specifica tion. y y y f y Y This invention relates tobraking systems, and has kparticular reference to rota meml bers suchlas motor driven 1velocipede wheels.

Heretojtore motor driven veloeiiiedesihavef been provide'dv'ith al'rontrand a rear brake each separately controlled., the first by a hand leverusually `disposed on the ,handle bars o'l? the machine, and the latteroperable through linkv connectionsA from `a pedal lever.` The use oi abrake on the front Wheel of motor driven velo,cipede` very often causesa] badY skid due to the amountot' Weight on the front Wheel as comparedvvith the load earried on the rear Wheel. y Such constructions haveusually comprised shoe members impacting' against the rim ol' the Wheeland which are connected by a tori?. member straddling,y the type and`rim vat the position at which the shoes are xed so' that the removal otthe Wheel from the machine ,greatly impeded-- lt is necessary on motordriven velocipedes to have two entirely separate brake controls. y

The object of the present` invention is to eliminate the necessity otthe` braking' unit on the front Wheel, While at the .same time providingtwo sepa vate operable brake conf` trol members. 4 4 f V y Non accordingto the presentv invention provide a single braking; unit comprising anexpanding' member tormedin sections operable by two independentcontrols, whereby one or more sections may be operated.sepa-` rately. orthe `Whole member simultaneously. By an expandingmember, l Meana Wheellike member havingij its rim built upl in sep,- aiate pivoted sectionsadapted `to be'` moved away 'from the centre ot the Wheel,member.v lnorder that my invention may be more clearly understood. l will non@v`describe the same with reference to the y accompanyinpdrawings inwvhiehFig. l shows a t'ront ration of the 'expanding member in relative,position with the ,fixed member; 2j is la lien in a plane throughthespindl 1920. serial no. Senese.

ot the rear road Wheel of a velocipede as indicated by the line y2-'-2of Fig; 1,' having a brake system, constructed according to myrinvention, applied to a driving member ot the ,rear road Wheel;Y 3shovvs a front vievv oi' a gear case member oft usual con'- struction,`but provided with alixeldl member in the form et a spiderto "constitutethe supi porting,- means ot the pivots of the expand? ing` member, andFig. 4l' is a general elevation ot a motor cycle, provided With a dualcontrol brake', constructed arfcording` to my invention, and operated bypedal and manual means. ,y

`Eeterring firstto Fig'. l,`the expandingy member `is, :termed by threepivoted segments, l, 2 and' 3 respectively, which are pivotally mountedon a fixed member d in the term ott aspiderWiththree arms', 5, 6 and 7,each carrying` a pivot centre indicated by the reference numerals 8, 9and lO respec# tively. n The segmental members l4 and 2 are mounted fona common centre S, `and inv oider to providey a plane surface round theexpandmemb'er, the ends of the segmental' members, mounted on the` pivot8 are ra'bbetedl, as iv`ll be clearly understood, yvitl reference to Fi2. The segmental member 3 is mounted on the. pivotcentre 9, and is alsorabbeted at its hinged extremity, morder to provide space Yfor a cammember ll, also mounted on the pivot centre 9, andso disposed at theface ofthe cam. so as to not protrude beyond asimilar tace of thesegmental members 2 and 3, While the pivot centrel() is mounted forrotation, the cam member l2 is mounted similar to the cam ll. y y

In the construction shown in Fig. l, it vvill be seen, that the free endot each `segmental member is juxtaposed against a cam", inthe one case,a segment 2 abuts against a cam 11 :md in the other ease, the segmentalmembers 1 yand 3 abut against a cam member l2. Further, thisnolrinalposition is maintained` by interconnecting the said tre`e ends by re`silient means, such as lugs and ysprii ifs ,llt` will be vseenthen`,that onlthe rotation of th e,cam' member 11, the segment 2 vvillbe moved away from the centre ot the ei;pand-` ingr member, ,and on therotfitionA of the cam 12, both the segments l and 3, `Will be movedoutwardly liabout their, pivots', and 'Eurther, that Oll @Pa plir @ifthe' Segntal members ments may be moved outwardly simultaneously. i

Considering now Fig. 2, in which the construction is applied to asprocket wheel 15 ot a rear road wheel ot a. velocipede, the sprocketwheel is mounted onsuitable bearings, such as 16 provided with drivingdogs 1T., for inter-engagement with'the hub otthe road wheel andco-aXially mounted on a sleeve member 18. through which is projected aspindle 1.() of the rear road wheel.

In the construction shown, a sleeve member 18 is carried by a. chainguard 20 of ordinary construction, and to a threaded extremity of thesleeve member 18, protruding through the chain guard 20, is secured afixed member 4 carrying thepivot centres 8, 9 andl 10. yAmud gua-rd asbefore stated is shown with the attachment 4 in Fig. 3.

In the application of the invention to a motor cycle, it is desired thatone control shall be by a foot pedal and the other by a hand lever; Iprefer `that the toot leverk shall operate the two segments of the handlever to cause the rotation of the cam, moving only one ysegment of theexpanding member. Accordingly, the foot lever 21 (Fig. 4) is connectedby rods 22 to a lever connection 23 shown in Figs. 2 .and 4, which inturn, is fixed to the cam 12, so that as the'pedal 21 is depressed, thecam 12 is rotated, thereby moving out the segments 1 and 3 intoengagement with the inner rim face of the sprocket 15 in such a manner,that it the sprocket is rotated, it will be braked by the rictionalcontact of the segmental members with the rim. The hand lever 24 isconnected by any known arrangen1ent,-r`or instance, Bowden cable,indicated at 25, Vfor opera-ting thelever 26 (F ig. 4) so that as thelever 24 is pulled towards the grip 25 on the handle bar of the machine,the cam 11 is rotated to effect the outward movevent of the segmentalmember 2, into contact with the inner face of the rim of the sprocket15. In both cases the levers 23 and 26 are returned to their normalposition, after operation, by suitable spring members, such as 27 and28. l

In the preferred foi-mot my invention, the expanding member comprises a.plurality of similar arcuate sections each pivoted equidistant fromtheir connnon describing centre. The-number of sectionswill depend onthe particular design required, but in the present case, I will describethe use of an expanding member comprising three sections. The

pivots for the sections may be supported in a spider' member having asmany arms asv there are sections. Two sections will be pivoted on acommon aXisVonV one arm` of the spider,` while the other vis pivoted Vonanothen'arm. When threef sections lare used, @ne Kseetien maybe'operable by the hand brake mechanism, while the two others may beoperable simultaneously by the pedal brake mechanism, and further thehand brake and the pedal brake may be operated simultaneously to moveall three sections away from' their describing centre. The means forobtaining the required moven'ient of the sections may be provided by theuse of a rotatable member, such as a cam, disposed adjacent the end ofeach section away from its pivot. The hand brake mechanism if onlyoperating one section may have its cam p'ivoted on an arm of the spiderand so shaped that when rotated, it causes a forcing out preferablyagainst a spring member, ott the respective section, while the pedallever may be caused to rotate a. single cam also pivoted on an arm ofthe spider and disposed between the tree ends of the two adjacentsections which are operable simultaneously by the pedal lever. These twosections may be lconnected by a spring member and one of them may alsobe connected to the section operated by the hand brake lever, thesprings acting to normally maintain the sections in contact with theirrespective cams and maintain them in the position defined by a circledescribed from their common centre and having a radius equal to theradius of the wheel like expanding member of which they normally form apart of the sectionalrim.

In the application of my invention tothe rear road wheel of a motordriven velocipede, I prefer to dispose the braking unit within thesprocket wheel, which may preterably be formed as a disc wheel, havingthe disc on one side of its hub and its rim comprising the teethdisposed on the bearing ot the rear wheel, and to complete thestructure.

a chain case may be so fitted, as to totally enclose, in combinationwith the sprocket wheel, the sections of the braking` unit.

In the preferred construction ot' my invention, the sections and thecams are so arranged that they form an even surface on each side` andthis may be obtained by cutting away a'portion of the end of thesections at their pivoted extremities in order that cach adjacentsection may overlap, or to provide the required movement of the cam, asthe case may be. f

It will be understood, that a spider meinber, instead of being mountedon the sleeve 18, may be tired to or formed integrally with the chaincase, either inside or outside: inv either case provided with aperturesthrough the case or the rim.` or both7 as the case may be. to receivethe three pivot centres;

I claim:

1. In a braking device, the combination the pivot portions of saidsegiients in jufjr'tan position, a further segmental member mounted onanother pivot 'centre disposed away from said pivot portions, means foreffecting the movement of two segmental members on distant pivot centrestowards said annular iriction tace,I land separate, independent meansfor eiiecting separate or similar simultaneous movement in the othersegment for the purpose of braking said annular friction face.

2. ln a braking device, the combination with a rotatable member havingan annular 'friction face formed thereon, a iixed member, three pivotcentres on said fixed mem-` ber, a pair of segmental members mounted onone ot said pivot centres, a third segmental member, and a rotatable cammember mounted on the second pivot centre, said cam member being incontact with the free end of one of said pair oi segmental members, asecond rotatable cam member mounted on the third said pivot centre, anddis posed between and in Contact with the free end of the other of saidpair of segmental members and the i'ree end ot' the third segmentalmember, and means t'or resiliently maintaining said free ends in contactwith said cam members and independent means ior separately rotating saidcams simultaneously or separately to effect the movement of saidsegmental members about their pivots and towards said annular face forthe purpose of braking said annular friction face.

3, In a braking device, the combination with a sprocket wheel of therear road wheel oi' a velocipede, of an inner fiat face formed on therim of said sprocket wheel, a fixed member, three pivot centres on saidfixed member, a pair of segmental members mounted on one of said pivotcentres, a third segmental member and a rotatable cam member mounted onthe second pivot centre,

said cam member being in contact with the free end ot one oi said pairof segmental members, a second rotatable cam member mounted on the thirdsaid pivot centre and disposed between and in Contact with the it'reeend of the other said pair of segmental members and the free end of thethird segmental member, and mea-ns for resiliently maintaining saidit'ree ends .in contact with said cam members and independent means forseparately rotating said cams simultaneously or separately to effect themovement of said segmental members about their pivots and towards saidannular face tor the purpose of braking said sprocket wheel.

Al.. ln a braking device, the combination with a sprocket wheel of therear road wheel of a relocipeden of an annular friction face formed onthe inner side of the rim ot said sprocket wheel, a gear case, a threearmed itting fixed on said gear case, a pivot centre on each arm of saidfitting., a pair of segmental members 'mounted on one of said pivotcentres, a third segmental member, and a rotatable 'cam member mountedon the second pivot centre, said cam member being in 'contact with thefree endot one of said pair' of segmental members, a second rotatable'cammember' mounted on' the third said pivot centre and disposed betweenand in contact with the free end of the other of said pair ot' segmentalmembers, and the free end of the third segmental member, means forresiliently maintaining said free ends in contact with said cam members,and independent means for separately rotating said cams simultaneouslyor separately to effect the movement of said segmental members abouttheir pivots and towards said annular friction face for the purpose ofbraking said sprocket wheel. i

5.111 a braking device, the combination with a sprocket wheel of therear road wheel of a velocipede, an inner fiat face formed on the rim ofsaid sprocket wheel, a gear case, a three armed fitting Xed on said gearcase, a pivot centre on each arm of said fitting, a pair ot' segmentalmembers mounted on one of said pivot centres, a third segmental member,and a rotatable cam member mounted on the second pivot centre, said cammember' being in contact with the free end of one of said pair ofsegmental members, a second rotatable cam member mounted on the thirdsaid pivot centre, and disposed between and in contact with the free endof the other of said pair of segmental members and the :tree end ot thethird segmental member, a lug near the free end of each said segmentalmember, tension springs interconnecting said lugs so that the free endsof the segmental members are maintained in contact with said cammembers, and separate independent means for separately rotating each ofsaid cams, simultaneously or separately to effect the movement of saidsegmental members, about their pivots and towards said annular face forthe purpose of braking said sprocket wheel.

6. ln a braking device, the combination with a sprocket wheel ot therear road wheel of a. motor driven velocipede, of an annular frictionflat face formed on the inner side of the rim of said sprocket wheel, agear case, a three armed .fitting tired on said gear case, a pivotcentre on each arm of said litt-ing, a pair of segmental members mountedon one of said pivot centres, a third segmental meinber, and a rotatablecam member mounted on the second pivot centre, said cam member being incontact with the Jfree end of one of said pair ot segmental members, asecond rotatable cam member mounted on the third said pivot centre anddisposed between and in contact with the free end of the other of saidpairfof segmental members, and the free end of the third segmentalmember, means for rosliently maintaining said free ends in Contact withsaid can@A members, vmanual means for rotating the Cain on the saidsecond pivot @entre and pedal means for rotant-l ing- 'the cam on thesaid third pivot centre, whereby the Cams may be operated separately orsnnulmneouslv to effect the move lCYRIL GEORG-E PULLIN.

